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Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
May. 31, 2015 | May. 31, 2014 | May. 31, 2013 | May. 31, 2012
Income Tax Contingency [Line Items] |  |  |  |
Effective tax rate, change from prior period | (180.00%) | (70.00%) |  |
Total gross unrecognized tax benefits, excluding related interest and penalties | $ 438 | $ 506 | $ 447 | $ 285
Total gross unrecognized tax benefits, excluding related interest and penalties, amount which would affect the Company's effective tax rate if recognized in future periods | 260 |  |  |
Increase in liability for payment of interest and penalties | (3) | 55 | 4 |
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit) | 164 | 167 |  |
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations | 63 |  |  |
Reinvestment of the cumulative undistributed earnings of certain foreign subsidiaries | 8,300 |  |  |
Unrecognized deferred tax liability associated with the indefinitely reinvested undistributed earnings | $ 2,700 |  |  |
Tax holiday, expiration period (year) | 2021 |  |  |
Decrease in income tax expense related to tax holiday | $ 174 | $ 138 | $ 108 |
Decrease in income tax expense related to tax holiday per diluted share, (in dollars per share) | $ 0.20 | $ 0.15 | $ 0.12 |
Valuation allowance increase (decrease) related to tax benefits of certain subsidiaries with operating losses | $ 0 | $ 4 | $ (22) |
Available domestic and foreign loss carry-forwards | 36 |  |  |
Income tax benefits attributable to employee stock-based compensation | 224 | $ 135 | $ 76 |
Tax Year 2011 | Domestic Tax Authority |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Proposed increase in tax related to the foreign tax credit matter | $ 31 |  |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition Amount of deferred tax liability not recognized because of the exceptions to comprehensive recognition of deferred taxes related to undistributed earnings of foreign subsidiaries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 + Details
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- Definition Estimated amount of loss resulting from an adverse tax position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The amount of income taxes from which a reporting entity is exempt or for which it will receive a reduction in income taxes as a result of the income tax holiday granted by the taxing jurisdiction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 11.C) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330215-122817 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 11 -Section C + Details
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